Allow @SpyBean to be used to spy on a Spring Data repository

Fixes gh-7033

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-data-jpa/src/main/java/smoketest/data/jpa/service/CityRepository.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,7 +22,7 @@ import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.repository.Repository;
 
-interface CityRepository extends Repository<City, Long> {
+public interface CityRepository extends Repository<City, Long> {
 
 	Page<City> findAll(Pageable pageable);
 

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-data-jpa/src/test/java/smoketest/data/jpa/SpyBeanSampleDataJpaApplicationTests.java

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2012-2021 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package smoketest.data.jpa;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import smoketest.data.jpa.service.CityRepository;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.jdbc.AutoConfigureTestDatabase;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.mock.mockito.SpyBean;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.context.WebApplicationContext;
+
+import static org.mockito.Mockito.verify;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * Tests for {@link SampleDataJpaApplication} that use {@link SpyBean @SpyBean}.
+ *
+ * @author Andy Wilkinson
+ */
+@SpringBootTest
+@AutoConfigureTestDatabase
+public class SpyBeanSampleDataJpaApplicationTests {
+
+	@Autowired
+	private WebApplicationContext context;
+
+	private MockMvc mvc;
+
+	@SpyBean
+	private CityRepository repository;
+
+	@BeforeEach
+	void setUp() {
+		this.mvc = MockMvcBuilders.webAppContextSetup(this.context).build();
+	}
+
+	@Test
+	void testHome() throws Exception {
+		this.mvc.perform(get("/")).andExpect(status().isOk()).andExpect(content().string("Bath"));
+		verify(this.repository).findByNameAndCountryAllIgnoringCase("Bath", "UK");
+	}
+
+}